Pentangle Shower Enclosures have, in recent years, been superseeded by quadrant shower enclosure, but still have a place in the shower enclosure market. Pentangle shower enclosure offer, what we think, as one of the best corner shower options on the market for small bathrooms and ensuites where space is a premium. Pentangle shower enclosures feature 3 sides of glass combined with a corner wall to form a 5 sided shower enclosure. Pentangle enclosure can come with an outward opening pivot door or an inward opening bifold door.