Splines<a href="https://pixelfed.social/discover/tags/Arch?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Arch</a> with <a href="https://pixelfed.social/discover/tags/Ionic?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Ionic</a> <a href="https://pixelfed.social/discover/tags/Entablature?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Entablature</a> and <a href="https://pixelfed.social/discover/tags/Keystone?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Keystone</a> Detail<br>
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The <a href="https://pixelfed.social/discover/tags/dentils?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#dentils</a> arrangement we saw in <a href="https://pixelfed.social/p/Splines/791013152244518907" rel="nofollow noopener" target="_blank">https://pixelfed.social/p/Splines/791013152244518907</a> goes well with the classic entablature <a href="https://pixelfed.social/discover/tags/profile?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#profile</a> we saw in <a href="https://pixelfed.social/p/Splines/790888454384861893" rel="nofollow noopener" target="_blank">https://pixelfed.social/p/Splines/790888454384861893</a>, and they both go well with <a href="https://pixelfed.social/discover/tags/simpleIntercolumniation?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#simpleIntercolumniation</a>, also known as <a href="https://pixelfed.social/discover/tags/architravato?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#architravato</a>.<br>
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However, with arches, the entablature profile has to be adjusted a bit so that the dentils arrangement is as shown here. The shape, size, and gap between individual dentils remains the same, but a crucial difference is that the dentils at the <a href="https://pixelfed.social/discover/tags/outer?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#outer</a> corners touch each other.<br>
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As I mentioned in <a href="https://pixelfed.social/p/Splines/803615973439041638" rel="nofollow noopener" target="_blank">https://pixelfed.social/p/Splines/803615973439041638</a>, in <a href="https://pixelfed.social/discover/tags/arcadeIntercolumniation?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#arcadeIntercolumniation</a>, the entablature is repeated on the wall behind the half-column. It doesn't end at the columns and has two "outside" corners and one "inside" corner. While the dentils at the outer corners touch each other, there is a single dentil in the inside corner that is shared by both walls. <br>
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A bedrock principle of dentils (like that with <a href="https://pixelfed.social/discover/tags/flutes?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#flutes</a> and with eggs in the <a href="https://pixelfed.social/discover/tags/EggsAndDarts?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#EggsAndDarts</a> motif) is that when viewed directly from the front or the sides, a dentil must be centered on the column axis. It is this principle that forces us to adjust the profile of the entablature in arcade intercolumniation giving us the arrangement shown here.<br>
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The image also shows the detail of the decoration in front of the <a href="https://pixelfed.social/discover/tags/keystone?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#keystone</a>. The most easily recognizable component of that is the large <a href="https://pixelfed.social/discover/tags/volute?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#volute</a>, which is the exact same size as the ones on the <a href="https://pixelfed.social/discover/tags/capital?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#capital</a>. The smaller volute is exactly half the size of the larger one. It is mirrored, rotated and put within a bounding rectangle whose height is exactly 2µ (288 units). The channels of both volutes are bridged with <a href="https://pixelfed.social/discover/tags/sinusoids?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#sinusoids</a> derived from half turn of <a href="https://pixelfed.social/discover/tags/helix?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#helix</a> curves that have been flattened.<br>
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This motif in the keystone, where volutes of different sizes are combined with sinusoids is very common. It will be seen in the <a href="https://pixelfed.social/discover/tags/modillions?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#modillions</a> of the <a href="https://pixelfed.social/discover/tags/modernEntablature?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#modernEntablature</a>.