redstrate.com/themes/red/layouts/_default/gallery.html

{{ define "main" }}
    {{ .Content }}

    {{ $art := site.Data.art }}

    {{ range $art.categories }}
        <h2>{{ .name }}</h2>
        {{ range sort .years "year" "desc" }}
            <h3>{{ .year }}</h3>
            {{ range .pieces }}
            <figure>
                {{ $thumb := resources.Get (printf "art-thumbs/%s" .filename) }}
                {{ $full := resources.Get (printf "art/%s" .filename) }}

                <a href="{{ $full.Permalink }}">
                    <img width="128px" height="128px" src="{{ $thumb.Permalink }}"/>
                </a>

                <figcaption>"{{ .title }}"</figcaption>
            </figure>
            {{ end }}
        {{ end }}
    {{ end }}
{{ end }}