<p>Harvard allows a maximum of 12 slides in an art submission. Is anyone going to submit more? Do you think it would be fine to bend the rules a bit and send 15?</p>
<p>I'd say stick to 12.</p>
<p>The reason they give that maximum is for time constraints. You're not going to gain favor with admissions officers by making them spend more time on a supplement than they planned to. It's also generally a good idea to follow directions.</p>
<p>If 12 slides will make your art submission look crappy and 15 will make it look great then send 15 or send nothing.</p>
<p>There's a good chance they'll only look at the first 12. If they said 12 you should send 12. Otherwise you're just the applicant who couldn't/wouldn't follow directions.</p>